Rhythm is a Digimon whose name is derived from "Rhythm", though with Argomon's name it is also a pun on "Algorithm" (アルゴリズム,Arugorizumu?). It has the appearance of a human girl.

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Rhythm first appears when the three main Digimon of the series Agumon, Gaomon and Lalamon, are considering what to do now that their partners are held captive. She looks at them for a brief moment and then gets chased by a group of Goblimon and an Ogremon.

After the trio assist and save her, they become friends and she assists them in trying to stop Argomon.